GB1305311A - - Google Patents
Info
- Publication number
- GB1305311A GB1305311A GB1305311DA GB1305311A GB 1305311 A GB1305311 A GB 1305311A GB 1305311D A GB1305311D A GB 1305311DA GB 1305311 A GB1305311 A GB 1305311A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- subsidiary
- cylinder
- main
- main piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/48—Arrangements for providing different damping effects at different parts of the stroke
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/48—Arrangements for providing different damping effects at different parts of the stroke
- F16F9/49—Stops limiting fluid passage, e.g. hydraulic stops or elastomeric elements inside the cylinder which contribute to changes in fluid damping
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
1305311 Shock absorbers JONAS WOODHEAD Ltd 13 April 1970 17450/70 Addition to 1267508 Heading F2S The main piston 8 of the shock absorber of Specification 1,267,508 is provided with a passage 13a and a valve element 61 which maintains the passage 13a closed or substantially closed except when, during movement of the main piston 8 in the direction out of the main cylinder 1, the pressure across the main piston 8 exceeds a predetermined value whereupon the valve opens. The main piston 8 is connected to a subsidiary piston 9 which slides in a subsidiary cylinder 25 at the beginning of the contraction stroke and at the end of the extension stroke, providing a threshold resistance to initial inward movement of the main piston 8 which is greater than the resistance to its final outward movement. When the main piston 8 begins to move into the cylinder (R.H.S. of Fig. 2) the 0-ring 38 seats against the upper part 34 of the subsidiary piston 9 and so fluid between the pistons can only escape to the back of the piston 9 by way of bleed notches 44 (optional). When the subsidiary piston 9 reaches the end of the cylinder 25, the threshold resistance is eliminated, and further inward movement of the piston 8 is regulated by valve elements 15, 16. Outward movement of the piston 8 is controlled by the blow-off valve element 61 and bleed notches 17 until the subsidiary piston 9 enters the subsidiary cylinder 25 (L.H.S. of Fig. 2), where the 0-ring 38 allows substantially free flow of fluid past the piston 9 and out of the subsidiary cylinder. The working fluid is an emulsion of liquid and gas under pressure.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1745070 | 1970-04-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1305311A true GB1305311A (en) | 1973-01-31 |
Family
ID=10095397
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1305311D Expired GB1305311A (en) | 1970-04-13 | 1970-04-13 |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1305311A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2500899A1 (en) * | 1981-02-27 | 1982-09-03 | Allinquant J G | Piston for hydraulic shock absorber - has flexible shim valves and some permanently open oil-ways to smooth movement |
US4901828A (en) * | 1988-03-21 | 1990-02-20 | Monroe Auto Equipment Company | Method and apparatus for controlling displacement of a piston in a shock absorber |
EP0565832A1 (en) * | 1992-04-11 | 1993-10-20 | AUGUST BILSTEIN GMBH & CO. KG | Hydraulic vehicle vibration damper |
US6446771B1 (en) | 1998-12-02 | 2002-09-10 | öHLINS RACING AB | Shock absorber |
EP3992493A3 (en) * | 2020-10-28 | 2022-11-09 | BeijingWest Industries Co. Ltd. | Hydraulic damper assembly and a piston for a hydraulic damper assembly |
US11732771B2 (en) | 2020-10-28 | 2023-08-22 | Beijingwest Industries Co., Ltd. | Hydraulic damper assembly and a piston for a hydraulic damper assembly |
-
1970
- 1970-04-13 GB GB1305311D patent/GB1305311A/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2500899A1 (en) * | 1981-02-27 | 1982-09-03 | Allinquant J G | Piston for hydraulic shock absorber - has flexible shim valves and some permanently open oil-ways to smooth movement |
US4901828A (en) * | 1988-03-21 | 1990-02-20 | Monroe Auto Equipment Company | Method and apparatus for controlling displacement of a piston in a shock absorber |
EP0565832A1 (en) * | 1992-04-11 | 1993-10-20 | AUGUST BILSTEIN GMBH & CO. KG | Hydraulic vehicle vibration damper |
US6446771B1 (en) | 1998-12-02 | 2002-09-10 | öHLINS RACING AB | Shock absorber |
EP3992493A3 (en) * | 2020-10-28 | 2022-11-09 | BeijingWest Industries Co. Ltd. | Hydraulic damper assembly and a piston for a hydraulic damper assembly |
US11732771B2 (en) | 2020-10-28 | 2023-08-22 | Beijingwest Industries Co., Ltd. | Hydraulic damper assembly and a piston for a hydraulic damper assembly |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |